Expansion joint groove forming device



June 14, 1932. R. c. THoMAssoN EXPANSIDN JOINT GROOVE FORMING DEVICEFiled Sept) 6, 1927 gmmtoo J2. aTiwmszs'am 1 a U I: I

Patented June 14, 1932 UNITED STATES PATENT OFFICE- EXPANSION JOINTGROOVE FORMING DEVICE Application filed September 6, 1927. Serial No.217,755.

This invention relates to a device designed for use in the formation ofa groove in a concrete road surface or the like to facilitate theformation of an expansion I 5 oint.

The primary object of the invention is to provide a device of thischaracter which will form a groove having vertical walls for thereception of the paper, tar or other filler employed in the constructionof the expansion joint.

A further object of the invention is to insure an even bearing on theconcrete on either side of the dummy joint expansion paper, used in theconstruction of the expansion joint. I

With the foregoing and other objects in view which will appear as thedescription proceeds, the invention resides in the combination andarrangement of parts and in the details of construction hereinafterdescribed and claimed, it being understood that changes in the preciseembodiment of the invention herein disclosed, may be madewithin thescope of what is claimed, without departing from the spirit of theinvention.

Referring to the drawing:

Figure 1 is a side elevational view of a device constructed inaccordance with the invention.

Figure 2 is a plan view thereof.

Figure 3 is a transverse sectional view through the roller of thedevice.

Referring to the drawing in detail, the device includes a handle portion5 having a downwardly extended end portion 6 terminating in a blade 7the opposite end of the handle portion being formed into a handgrip 8whereby the device may be moved to accomplish its purpose.

The handle is bolted between the ends 9 of the arms 10 which have theirforward ends formed into bearings 11 for the reception of the axle 12 onwhich the sectional roller 13 is secured.

Removably supported on the axle 12 and clamped between the inner ends ofthe sections of the roller 13 is a disk-like blade 14, the disk-likeblade being of a diameter so that the cutting edge thereof extends anappreciable distance beyond the roller 13 exposing a large portion ofthe disk so that the groove formed thereby will have sufficient depth toinsure a practical expansion joint.

The sections of the roller 13 as well as the blade 14 have aligningopenings, the openings of one section being formed with threads toaccommodate the threaded extremity of the screw 15, which when properlypositionno ed, acts to draw the sections of the roller 13 together intogripping relation with the member 14.

Washers 16 are supported on opposite sides of the bearings 11 and cotterkeys 17 are provided for holding the axle in position. Thus it will beseen that due to the construction of the roller and disk-like blade 14,the sections of the roller may be disconnected and the blade 14 removedand replaced, should the blade become dull, or otherwise renderedinoperative.

The groove forming device also embodies an elongated guide plate 18which is formed with straps 19 at its ends, which straps re- 'ceive theright angled extremities 20 of the lifting irons 21, to the end that thedevice may be readily and easily lifted or moved from place to place.

Disposed intermediate the side edges of the so guide plate 18 andarranged longitudinally thereof, is the guide slot 22 in which thedisklike blade 14 moves when the device is in operation. As shown, thisslot 22 has its ends disposed adjacent to the ends of the plate 18, thelength of the slot being however sufiicient to guide the blade in theformation of a groove in a concrete surface, during the construction ofan expansion oint, it being underst-ood that the length of the guideplate 18 will be varied according to the work for which the device is tobe used, that is to say,

if an expansion joint groove is to be formed in a wide roadway, a longerguide plate 18 will necessarily have to replace a shorter guide plateused for the formation of an expansion groove in a sidewalk.

In the use of the device, the concrete is poured between the usualforms, and the plate is placed thereover, the plate resting on the m0upper edges of the forms in a manner as shown by Figure 1. The blade 7is now positioned within the slot of the guide plate at a point adjacentto one of the forms and pressed downwardly, and moved a short distancefrom the form, thereby forming a groove adjacent to the forms, whichcould not otherwise be formed by the blade 14.

The blade 14 is now dropped into the slot and the device is movedthroughout the length of the guide plate 18, with thezresult that agroove having vertical walls is provided, the surface ofthe concreteadjacent to the groove being level.

The material of which the expansion joint is formed may now bepositioned in the groove. 7

I claim;-

1. In a device of the character described, a roller, a cutting diskdisposed at a point intermediate the ends of the roller and -havingportions thereof extended beyond the periphery of the roller, a guideplate having a slot through which the cutting disk. operates to cutmaterial under the plate, and

'meansfor operating the roller.

2. In a device of the character described, an axle, a sectional rollermounted on the axle, a'disk-like cutting member mounted on the axle,portions thereof extending-beyond the periphery of the roller, a guideplate havingla slot through which the-cutting member operates, to cutmaterialthereunder, and a handle for moving'the .roller over the guideplate.

3. In a device of the character described, a frame, an axle supported bythe frame,.a sectional roller mounted on the axle, a.disk-like cuttingmember clamped between the adjacent ends of the sections of theroller,..means extending through the sections of the roller anddisk-like cutting member for holding. the sections of the roller anddisk-like cutting member together, a guide plate having a slot extendingthroughout the length thereoflsaid guide plate providing a support forthe roller, said disk-like cuttingmember-operating through the slot tocut material thereunder, and means for movingthe roller over the guideplate.

4. Ina device of the character described, a supportingaxle, a rollermounted ontheaxle,

a disk-like cuttin member on the .axle and disposed interme iate theends of, the roller, a handle, arms connected with the handleand havingbearings formed at their outer ends, said bearings accommodating theaxle, ,a

bearing plate having a slot formed therein,

said roller adapted to moveover the :bearing plate, and said disk-likecutting .member adapted to move through the. slot to .cut materialthereunder.

5. In a device of the character described, an axle, a roller .mounted onthe axle, a blade supportedon the axleat apoint intermediate the ends ofthe roller, an elongated guide plate having a slot formed therein, andthrough which the blade moves, a handle, arms secured to the handle andhavin bearings in which the axle moves, said andle having a downwardlyextended end portion formed into a blade, the last mentioned bladeadapted to operate through the slot to cut material supportedthereunder, and said handle affording means to permit the device to bemoved longitudinally of the guide plate.

6. In a device of the character described, a weighted roller, a bladecarried by the roller, a handle for operating the roller, a blade formedat one end of the handle and lying adjacent. to the first mentionedblade, a guide plate over which the roller moves, said guide platehaving a slot extended therethrough toaccommodate theblades, and meansfor securing the blade to the roller.

7. Adevice of the class described, a rotary knife-like cutter, means formoving the same over the surface of a concrete structure to produce aslot in, said structure, and means for guiding said cutter comprising arelatively long portable board-likestrip adapted to be laid over thesurface of the concrete, and a slotin said strip adapted to receive saidcutter, a mounting for said cutter comprising a roller adapted to bridgethe slot in the strip with the cutter received by the slot, the surfaceof the strip on opposite sides of the slot, providing a treadsurface forsaid rollers substantially as and for the purpose described.

In testimony that I claim the foregoing as my own, I have hereto afiixedmy signa-

